EP0177348A1 - Abrasive tool - Google Patents

Abrasive tool Download PDF

Info

Publication number
EP0177348A1
EP0177348A1 EP85307063A EP85307063A EP0177348A1 EP 0177348 A1 EP0177348 A1 EP 0177348A1 EP 85307063 A EP85307063 A EP 85307063A EP 85307063 A EP85307063 A EP 85307063A EP 0177348 A1 EP0177348 A1 EP 0177348A1
Authority
EP
European Patent Office
Prior art keywords
strip
tool according
toothed
blades
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85307063A
Other languages
German (de)
English (en)
French (fr)
Inventor
Charles Edward Filby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0177348A1 publication Critical patent/EP0177348A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/18—File or rasp
    • Y10T407/1815—Rotary file or round disc

Definitions

  • This invention relates to an abrasive tool which is particularly but not exclusively designed for use with a settible filler material for example in body repair work on motor vehicles.
  • any dents or depressions are filled with a settible body filler which is usually a mixture of a filling material and a hardener whereby the material sets hard after a predetermined period of time generally in the order of 5 to 10 minutes.
  • a settible body filler which is usually a mixture of a filling material and a hardener whereby the material sets hard after a predetermined period of time generally in the order of 5 to 10 minutes.
  • a settible body filler which is usually a mixture of a filling material and a hardener whereby the material sets hard after a predetermined period of time generally in the order of 5 to 10 minutes.
  • a cheese-grater device which shaves off an upper layer of the material so as to shape it initially generally to the required contours.
  • the cheese-grater device can only be used on the material while it is hardening and hence is in a semi-moist state.
  • the material is sanded using generally 40 grade sandpaper which smooths the repair down to a smooth and properly contoured shape for painting and finishing.
  • the painting and finishing steps often involve a first layer of primer followed by a putty glaze which is then sanded to remove any scratch marks from the initial rough sanding of the filler material.
  • the finished repair is painted using conventional techniques.
  • the sandpaper must be continually replaced since it tends to clog with the removed material and of course it rapidly wears. Large quantities of sandpaper are therefore consumed in a commercial process where body repair is carried out on a regular basis. Furthermore the sandpaper has a number of problems in that it develops dust which fills the atmosphere and of course is unsatisfactory from an health and environment point of view. In addition, the sandpaper can only be used when the filler material has effectively set hard since otherwise it rapidly clogs and becomes ineffective after a few strokes. This is disadvantageous because it creates the dust and in addition the material is much more difficult to work.
  • an abrasive tool comprising a plurality of toothed strip portions, a set plastics filler material in which said strip portions are embedded so that the filler material rigidly supports the strip portions along their full length, and a support surface from which the teeth of the strips portions project for engaging and abrading a work surface generally parallel to the support surface, the strip portions being spaced from each other so as to sequentially engage the work surface as the support surface moves relative thereto and so as to allow self-cleaning from between the strip portions of material removed from the work surface by the strip portions.
  • the toothed strip portions embedded in the plastics material are preferably spaced by a wide distance which is significantly greater than the width of the strips themselves so that the self-cleaning effect is obtained.
  • the strip portions are formed from saw blade with a direction of cut longitudinal of the saw blade.
  • the blades can be arranged side by side longitudinally of a rectangular body but in other cases a circular disc-type device can be provided with the blades arranged generally radial to the disc but with a curvature away from the radial direction.
  • the toothed strips which include saw-cut teeth are arranged to project upwardly from the support surface by a very small distance which can be less than the width of the shoulder, less than the spac- in g and preferably less than 1/8 inch.
  • the surface also is preferably continuous and substantially imperforate so that it defines a backing plate which is rigid and protects the toothed strips or blades. This provides a rigid tool which avoids any possible gouging of the material and also channels the removed material toward the ends of the tool along between the toothed strips.
  • a tool of this type is apparently to the eye very much rougher than the 40 grade sandpaper which it replaces. However, surprisingly it can produce a very fine finish and can be used both on the material while it is setting and after setting. Use while the material is setting avoids the creation of dust and the heavier larger particles which are therefore removed tend merely to travel along the length of the tool along between the toothed strips.
  • the tool of this type can have a life of at least six months thus replacing large quantities of sandpaper.
  • the tool comprises a base plate 10 which has five elongate slots 11 along the length thereof. Sides 12 of the base plate are turned upwardly to define sidewalls and endwalls 13 are turned upwardly to define end flanges thus forming a box section. For rigidity the sides 12 can be welded to the end plates 13 to form a completed box section.
  • the box section can be manufactured by a stamping technique where the shape is cut from a blank simultaneously with the formation of the slots and subsequently the sides and ends are folded to form the box section as shown best in Figures 2 and 3.
  • the dimensions of the base plate are arranged to match the standard dimensions of a powered orbital sander so that in one example the base plate has a width of the order of 3 inches and a length of the order of 16 inches.
  • the side plates 12 and the end plates 13 are also shaped to cooperate with the attachment mechanism of the conventional powered sander and these can be shaped accordingly depending upon requirements.
  • the slots 11 extend along substantially the full length of the base plate with a central slot 110 which is substantially straight and along the center line of the base plate. On either side of the central line is provided a pair of further slots 112, 113 which are substantially equidistantly spaced so that the outer most slot is of the order of 1/4 inch from the edge 14 of the base plate, the next spacing is 1/2 inch and the innermost spacing is 5/8 inch. These dimensions can of course be slightly modified in accordance with the requirements.
  • a toothed strip 16 is laid into each of the slots so that a toothed edge 17 of the toothed strip projects through the slot and extends outwardly from the base plate 10.
  • the extent of projection is very small relative to the width of the tool and can be less than 1/8 inch.
  • the toothed strips 16 can be formed from conventional hacksaw blades which have saw-cut teeth. As is well known saw-cut teeth have a direction of cut and a return direction and also are twisted outwardly to the sides to provide a cutting action.
  • the blades can be of the order of 1/16 inch in width and thus are very narrow relative to the width of the tool. Alternatively, the blades can be formed without the side to side curvature of saw-cut blades.
  • the blades include a control curved section 115 which helps to locate the blade relative to the plate 10.
  • the toothed strips or blades are embedded in a resin material or other suitable setting rigid plastics material indicated at 18.
  • the resin material is filled into the box section to a level just to cover the upstanding edges of the blades 16 so as to form a rigid support both for the base plate and for the blades.
  • the sides 12 and the end plates 13 extend upwardly beyond the upper surface of the resin 18 to provide Connection to the sander device as previously explained.
  • the sides and ends can include dimples 121, 131 to assist in interlocking the outer box structure and the resin layer 18.
  • the blades can be inserted into the base plate while the latter is resting over a suitable spacer including grease or other suitable material into which the blades can be pressed.
  • the resin material can then be simply injected or poured onto the base plate up to the required level following which the base plate can be lifted from its support to complete the formation of the rigid tool.
  • the slots 11 curve inwardly at the ends of the tool so the spacing therebetween is reduced and the spacing between the outermost blade and the edge 14 is increased.
  • This has a number of advantages in that firstly the blades can be positioned in the slots and can remain in position by the tension developed by their curvature in the slot. Secondly the inward curvature of the blades at the end of the tool defines an area which can be used for finer or smaller work. Thirdly the spacing between the outermost blade and the edge 14 is increased at the end to reduce the possibility of gouging as will be explained more hereinafter.
  • the blades also extend all the way to the end of the plate 10.
  • the blades as shown in Figure 1 are basically parallel bearing in mind the slight curvature inwardly at the ends. This defines a spacing between the blades which is substantially constant and which is very much greater than the width of the blade itself. In one example where the blade is 1/16 inch in width and the spacing between the blades is of the order of 1/2 inch, the spacing is 8 times greater than the width of the blade. In other examples or where the spacing is reduced, this ratio can be reduced to 5:1.
  • the height of the blade relative to the base plate 10 is very small relative to the width of the tool and to the spacing between the blades.
  • a spacing of 1/8 inch can be used which provides a tooth height of the order of 1/16 inch and a height of blade portion between the surface 10 and the bottom of the teeth of the order of 1/16 inch.
  • This dimension can of course be modified but it is chosen so as to avoid the possibility of the blades gouging the material and also to provide complete and rigid support for the blades to prevent their flexing and thus reducing the quality of the finish.
  • the teeth of the central blade 110 are directed in one direction, the teeth of the next adjacent outer blades arranged in the opposite direction and finally the outermost blades have their teeth in the same direction as the central blade and this assists in providing a smooth working action since the orbital movement provides some cutting in both directions.
  • the tool is applied to the filler to act as a rough initial shaper and then as a finer shaper thus replacing the conventional cheese grater and 40 grade sandpaper.
  • the filler can be worked upon while in the incompletely set condition, the work can proceed very much more quickly without the creation of dust.
  • the wide spaces between the blades allow removed material to break away from the teeth and to run longitudinally of the tool between the blades to the ends where the material merely escapes. As it is in a softer or unset condition the particles can coagulate rather than create a fine cloud of dust.
  • the tool if used skillfully can create a sufficiently smooth finish so that the conventional putty glaze is not required.
  • This smooth finish can be obtained either by careful use of the tool while the filler material is still in the incompletely set condition or the tool can be reused at a later time when the material has been fully set to provide a final finishing effect.
  • the appearance of the tool is that it has a roughness very much greater than that of conventional sandpaper and that the widely spaced blades could do no more than roughly cut the material and provide gouges and channels in the filler material. Totally surprisingly and to the contrary, the tool can not only provide the initial rough shaping but also can provide a fine smoothing effect far greater than conventional 40 grade sandpaper.
  • attachment plates for supporting the tool relative to the workface of a conventional powered orbital sander
  • the tool could be manufactured with handles for manual operation or with modified attachment means for attachment-to various other arrangements of powered sander or merely as a flat plate like object for manual grasping.
  • the blades or toothed strips are shown to be substantially straight and longitudinal of the tool, they could be arranged in other configurations including circular arrangements.
  • the number of teeth per inch can vary to provide varying degrees of coarse or fine sanding effect.
  • a circular disc type sander can be manufactured in a similar manner using toothed strips or blades arranged radially of the disc.
  • the toothed strips can be embedded in a plastics material without any supporting base plate so that the surface of the plastics material provides the support surface from which the teeth protrude.
  • a suitable plastics material can be Delron 100 (trade mark) from Dupont. Using this material a handle or clamping flange can be attached to the plastics body by screws into the end faces of the plate like plastics body.
  • Figures 4, 5 and 6 show a modified sanding tool which is of a circular flat disc shape with the toothed strips arranged so that the teeth extend outwardly from one flat face of the disc.
  • the disc is shown at 50 and includes a central bore 51 and recess 52 by which the disc can be_attached to a suitable driven rotating device for example a drill or powered sander.
  • the disc is substantially wholly formed from the plastics filler material without any supporting structures apart from the toothed strips or blades themselves which are generally indicated at 53.
  • the toothed strips or blades 53 are curved or bent and are relatively short in length so as to extend arcuately around approximately 70 degrees of the disc while moving outwardly on an increasing radius from a position closer the centre to a position adjacent the outer edge but spaced therefrom by a portion providing a shoulder.
  • the thickness of the disc 50 is generally less than the depth of the blade 53 so that ribs 55 are formed on the rear side of the disc into which the blades 53 extend, each blade having its own rib 55.
  • the ribs 55 are formed with enlarged circular ends 56 to accommodate the ends of the blades to prevent cracking of the disc at the ends of the blades.
  • An edge of the disc 54 is turned upwardly to the rear side and is connected to a plurality of radial stiffening ribs 57. Thus the ribs 57 and edge 54 provide rigidity for the disc while using a minimum of plastics in the formation of the disc.
  • the toothed strips or blades 53 have a direction of cut as a conventional saw blade which is arranged so that the blades cut as they are moved inwardly toward the center of the disc.
  • each blade as it passes a particular point cuts from its inner most edge outwardly toward the outer edge so that material cut away from the work piece is moved outwardly from the blades towards the edge of the disc.
  • the blades 53 thus stand outwardly from a planar smooth surface 60 on a working side of the disc.
  • the dimensions of the blades relative to the surface 60, the edge 54 and to one another are as previously described in relation to the first embodiment to obtain a rigid tool with self-claning effect.
  • the plastics disc can be firstly molded from the preferred plastics Delron 100 (trade mark) with slots 59 for receiving the blades in a later step.
  • the slots can have circular enlarged ends so that any movement of the blade relative to the plastics at the end caused by expansion or contraction does not cause cracking of the plastics.
  • the curved blades cut to the right length can be bonded into the slot by a bonding agent such as Caylite (trade mark).
  • the sanding disc of Figures 4, 5 and 6 In operation of the sanding disc of Figures 4, 5 and 6, it can be placed flat on a surface and driven in the stated direction.
  • the self-cleaning effect obtained by the spacing of the blades and the rigidity of the disc allow the disc to cut cleanly and effectively over the full area of the disc without vibration or "walking" of the disc as occurs with conventional generally flexible sanding tools such as sanding discs or paper.
  • the toothed strip portions are provided by a single toothed strip or blade which is arranged in a spiral fashion so that one portion lies alongside a radially outer portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Milling Processes (AREA)
EP85307063A 1984-10-02 1985-10-02 Abrasive tool Withdrawn EP0177348A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA464565 1984-10-02
CA464565 1984-10-02

Publications (1)

Publication Number Publication Date
EP0177348A1 true EP0177348A1 (en) 1986-04-09

Family

ID=4128826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85307063A Withdrawn EP0177348A1 (en) 1984-10-02 1985-10-02 Abrasive tool

Country Status (3)

Country Link
US (1) US4639989A (enrdf_load_stackoverflow)
EP (1) EP0177348A1 (enrdf_load_stackoverflow)
JP (1) JPS61127916U (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7993185B2 (en) * 2007-01-17 2011-08-09 Russell Gelfuso Device for smoothing the surfaces of hard or soft materials

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB663580A (en) * 1949-04-04 1951-12-27 Weatherley Oilgear Ltd Broaching tools
DE886383C (de) * 1951-08-02 1953-08-13 Carl Klingspor Schleifvorrichtung
US3050827A (en) * 1958-07-09 1962-08-28 Hedda Wertheimer Abrasive elements
DE1577584B2 (de) * 1966-03-30 1977-03-17 Rudolf Heger, Hamedis-Diamantwerkzeug- U. Maschinenfabrik, 7801 Umkirch Schleifscheibe mit metallisch gebundenem diamantbelag

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB172899A (en) * 1921-03-29 1921-12-22 Ludwig Bartmann Improvements in rotary disk rasps, files and cutters
FR538474A (fr) * 1921-07-19 1922-06-10 Lime pour dessinateurs et son procédé de fabrication
GB442354A (en) * 1934-07-13 1936-02-06 Simon Seifried Improvements in files and rasps
US2549570A (en) * 1946-04-09 1951-04-17 Austin Wier S Surface conditioning tool
AT174200B (de) * 1949-05-14 1953-03-10 Aug Hermann Hollmann Saegen U Holzsägenraspel
US3623200A (en) * 1970-03-30 1971-11-30 Gen Motors Corp Blending device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB663580A (en) * 1949-04-04 1951-12-27 Weatherley Oilgear Ltd Broaching tools
DE886383C (de) * 1951-08-02 1953-08-13 Carl Klingspor Schleifvorrichtung
US3050827A (en) * 1958-07-09 1962-08-28 Hedda Wertheimer Abrasive elements
DE1577584B2 (de) * 1966-03-30 1977-03-17 Rudolf Heger, Hamedis-Diamantwerkzeug- U. Maschinenfabrik, 7801 Umkirch Schleifscheibe mit metallisch gebundenem diamantbelag

Also Published As

Publication number Publication date
JPS61127916U (enrdf_load_stackoverflow) 1986-08-11
US4639989A (en) 1987-02-03

Similar Documents

Publication Publication Date Title
JP3455224B2 (ja) 角度グラインダ用アクセサリ
US5243790A (en) Abrasive member
EP1814696B1 (en) Finishing tool
CN1171072A (zh) 改进的分段式切割工具
US6280309B1 (en) Accessories and attachments for angle grinder
CA2074225A1 (en) Contour sanding device
US6632131B1 (en) Combination rotary cutting and sanding blade
US4668248A (en) Grinding disk and method of manufacturing such a disk
US4628976A (en) Wood surfacing blade
US7993185B2 (en) Device for smoothing the surfaces of hard or soft materials
US3619878A (en) Sheet metal speed file
US4639989A (en) Sanding tool
US5636556A (en) Device for conditioning and sharpening the blade of a scraper tool
US2658258A (en) Tire buffing band
US2549570A (en) Surface conditioning tool
US1273060A (en) Concrete edging and marking tool combined.
WO2005037486A2 (en) Multiple cutting edged sanding wheel
EP0855949B1 (en) Accessories and attachments for angle grinder
EP1306167B1 (en) Tool for surface roughing, in particular for flooring
JP5674229B1 (ja) 充填剤研磨具の充填剤屑の除去方法
JP3782089B2 (ja) 出隅柱の頂角部に面取り加工を施す方法と装置
CN2160519Y (zh) 一种加工木质企口地板用的铣刀
US2694850A (en) Rotary file
JP3652772B2 (ja) アンカーボルト周囲の削り具
JPH0392253A (ja) 合成樹脂硬質発泡体の加工方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19861007

17Q First examination report despatched

Effective date: 19871230

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890501